Updating PLAIN framework

Added pipelining support and db, update tests.
Added fortunes test to PLAIN
Update Undertow version

Gives a slight speed boost due to path handler improvements
Don't use snapshot netty version

This at least allows the test to run. This is not the most
recent version of netty as it appears the API changed between CR and final.
Don't use MediaType.toString()

The result is not cached and it is really slow (according to yjp about 13%
of CPU time).
Merge pull request #386 from stuartwdouglas/master

Update Undertow version and use non-snapshot version of netty
Merge pull request #385 from weltermann17/updating-plain

Updating PLAIN (all tests now, pipelining)
added uwsgi for python with gevent loop engine
fix indentation
Merge remote-tracking branch 'gdamjan/master' into python-update
uwsgi: Support Python3. Stop accless logging to stdout.